<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<style>
    *{
        margin: 0px;
    }
    .annu{
        width: 100%;
        height: 52px;
        background-color: aquamarine;
        border: 0px;
        color: aliceblue;
        flex-grow: 1;
        border: 1px solid wheat;
        text-align: center;
    }
    .opp{
        display: flex; 
    }
    span{
        line-height: 52px;
        transition: 1s;
    }
    .annu:hover{
        background-color: rgb(10, 105, 74);
    }
    .annu:hover span{
        background-color: rgb(10, 105, 74);
        display: inline;
    }
    .laoda{
        width: 100%;
        height: 300px;
        background-color: antiquewhite;
        display: none;
    }
    .annu:hover .laoda{
        display: block;
    }
    .btn:hover .laoda{ 
            display: block;
            position: relative;
            top: 0px;
        }
    .itme{
            width: 100%;
            height: 48.5px;
            border: 1px solid grey;
        }
    .laoda{
        position: relative;
            top: -300px;
            width: 100%;
            height: 300px;
            background-color: aquamarine;
            transition: 0.5s;
            z-index: -1;
            overflow-x: -1;
    }
</style>
<body>
    <div class="opp">
        <div class="annu">
            <span>阿牛</span>
            <div class="laoda">
                <div class="list">
                    <div class="itme">列表</div>
                    <div class="itme">列表</div>
                    <div class="itme">列表</div>
                    <div class="itme">列表</div>
                    <div class="itme">列表</div>
                    <div class="itme">列表</div>
            </div>
        </div>
        <div class="annu">
            <span>撒旦</span>
            <div class="laoda">
                <div class="list">
                    <div class="itme">列表</div>
                    <div class="itme">列表</div>
                    <div class="itme">列表</div>
                    <div class="itme">列表</div>
                    <div class="itme">列表</div>
                    <div class="itme">列表</div>
            </div>
        </div>
        <div class="annu">
            <span>撒旦</span>
            <div class="laoda">
                <div class="list">
                    <div class="itme">列表</div>
                    <div class="itme">列表</div>
                    <div class="itme">列表</div>
                    <div class="itme">列表</div>
                    <div class="itme">列表</div>
                    <div class="itme">列表</div>
            </div>
        </div>
        <div class="annu">
            <span>撒对</span>
            <div class="laoda">
                <div class="list">
                    <div class="itme">列表</div>
                    <div class="itme">列表</div>
                    <div class="itme">列表</div>
                    <div class="itme">列表</div>
                    <div class="itme">列表</div>
                    <div class="itme">列表</div>
            </div>
        </div>
        <div class="annu">
            <span>撒市</span>
            <div class="laoda">
                <div class="list">
                    <div class="itme">列表</div>
                    <div class="itme">列表</div>
                    <div class="itme">列表</div>
                    <div class="itme">列表</div>
                    <div class="itme">列表</div>
                    <div class="itme">列表</div>
            </div>
        </div>
    </div>
</body>
</html>